CN104980995A - Wireless Communication Device and multimode Mobile Communication Network Search in a wireless communication device - Google Patents
Wireless Communication Device and multimode Mobile Communication Network Search in a wireless communication device Download PDFInfo
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- CN104980995A CN104980995A CN201510147857.0A CN201510147857A CN104980995A CN 104980995 A CN104980995 A CN 104980995A CN 201510147857 A CN201510147857 A CN 201510147857A CN 104980995 A CN104980995 A CN 104980995A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
Abstract
A wireless communication device includes a wireless transceiver to wirelessly receive and transmit radio frequency (RF) signals and sample a signal representative of the received RF signal over a predetermined time period. The receiver stores the sampled signal in a memory. After the predetermined time period, a processor, coupled to the wireless transceiver and the memory, concurrently searches the sampled signal for multiple communication signals each operating according to a corresponding one of multiple, different mobile communication standards. If one of the communication signals is found, the WCD attempts to connect wirelessly with a communication network from which the found communication signal originates.
Description
Technical field
The present invention is relevant to the Web search technology in wireless mobile communication devices.
Background technology
Have in the world many kinds according to the running of different mobile communication standard different frequency range wireless/mobile communication network.The wireless communication apparatus such as smart phone can be designed to be suitable for multiple communication standard or wireless transmit-receive technology.Generally speaking, can not be designed between wireless communication apparatus and frequency range that there is particular association.In addition, wireless communication apparatus can coordinate the different carrier in same frequency range.For the multiple wireless transmit-receive technology in different countries or region, adjust frequency range configuration by adjuster (regulator).Even if in a specific region, different telecommunications service dealers can use different wireless transmit-receive technologies in each frequency range, and even same telecommunications service dealer also may change its setting in time.Before obtaining Communications service, wireless communication apparatus must first find available network.In traditional wireless communication apparatus Web search technology, wireless communication apparatus can select a frequency range and in wherein searching the network according to a particular network standard running, is then adjusted to by its receiver and can receives multiple candidate carrier in this chosen frequency range (relevant to by the wireless transmit-receive technology searched).Wireless communication apparatus can distribute to each chosen carrier frequency 5 or 10 milliseconds, and in each frequency range, searches the signal with particular radio-frequency waveform, to attempt to find out the continuous downstream signal frame meeting a certain network standard.Wireless communication apparatus can sequentially repeat this searching procedure for all possible carrier frequency of each heterogeneous networks, until find an available network.Current number of frequency bands in the world more than 40, and will continue to increase.If there are hundreds and thousands of kinds to search possibilities, above-mentioned searching procedure is suitable inefficiency and consuming time.
Summary of the invention
The invention provides a kind of method that moving multi communication network is searched, comprise: (a), in a predetermined period, the multiple radiofrequency signals for wireless receiving are carried out sampling and recorded a sampled result, and this sampled result has about a radio-frequency (RF) energy; B (), after this predetermined period terminates, searches the multiple communication signals belonging to multiple different mobile communication standard in this recorded sampled result simultaneously; And if (c) finds one of the plurality of communication signal in this sampled result, attempt setting up wireless link with the communication network belonging to this communication signal.
The present invention also provides a kind of wireless communication apparatus, comprises the wireless transceiver in order to transceiving radio frequency signal.This wireless transceiver is sampled out and can be represented the inphase/orthogonal signal of the radiofrequency signal received in the period predetermined.This receiver stores the inphase/orthogonal signal be sampled in a memory.After the period that this predetermines terminates, the inphase/orthogonal signal be sampled searched by the processor being coupled to this wireless transceiver and this memory simultaneously, to find out separately according to the multiple communication signal of different mobile communication standard running.If find out a communication signal, this wireless communication apparatus just attempts the communication network that wireless link sends this found communication signal.
The present invention separately provides a kind of non-transient state entity handles device fetch medium, wherein store multiple instructions that can be performed by a processor, the plurality of instruction be performed this processor of rear drive with: obtain a sampled result, this sampled result can represent a radio-frequency (RF) energy of multiple radiofrequency signals of wireless receiving in predetermined period; Search the multiple communication signals belonging to multiple different mobile communication standards separately in this sampled result simultaneously; And if in this sampled result, find one of the plurality of communication signal, attempt setting up wireless link with a communication network belonging to this communication signal.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 presents the schematic diagram of the mobile communication network environment that can realize according to multimode network search technique of the present invention.
Fig. 2 presents the functional block diagram example of the wireless communication apparatus that can realize multiple modes search technology.
Fig. 3 presents the flow chart according to multimode network method for searching of the present invention.
Fig. 4 presents after a thread expansion, the flow chart be made up of succession of steps.
Fig. 5 presents the frequency spectrum example that fast fourier transform produces for sample energy.
Fig. 6 is the relativeness that ordered steps and multiple parallel cross-thread are described.
Fig. 7 presents a LTE data assemblies example in storage data storehouse.
Should be noted that, Fiao figure of the present invention comprises the functional block diagram presenting multiple functional module associated with each other.These graphic not thin portion circuit diagrams, and connecting line is wherein only in order to represent signal stream.Multiple interactive relationship between functional element and/or program not necessarily will begin to reach by direct electrically connect.In addition, the function of Individual elements not necessarily will the mode as illustrated in graphic be distributed, and the block of discrete not necessarily will realize with the electronic component of discrete.
In figure, element numbers is described as follows:
100: network environment
104: wireless communication apparatus
106: wireless communication signal
110: moving multi communication network
112: long-term evolution network
114: wide band code division Division of Network
116: time division synchronous code division multiple access network
118: mobile communication global system network
206: radio transmitter
207: antenna
208: wireless receiver
208a: radio-frequency (RF) front-end circuit
208b: analog-digital converter
208c: low pass filter
210: sample buffer
212: controller
213: control signal
214: controller storage
216: User's Interface
220: multimode network searches logic
224: frequency scanning logic
226: network base station searches logic
230: wireless transmit-receive technology parameter/restricting data storehouse
266: sample after filtering
300: multimode network method for searching
305 ~ 340: process step
400: thread thin portion flow process
405 ~ 415: process step
500: frequency spectrum
P1, P2, P3: priority
F1, F2, F3: centre frequency
320a ~ 320d, 602 ~ 608: thread
700:LTE data assemblies
Embodiment
Fig. 1 presents the schematic diagram of the mobile communication network environment that can realize according to multimode network search technique of the present invention.Network environment 100 comprises a wireless communication apparatus 104, in order to transmission/reception wireless communication signal 106, links up with moving multi communication network 110.In moving multi communication network 110, each network operates according to different Mobile communication air interface standards (wireless transmit-receive technology); Network wherein may cover overlapping geographic area, also may cover diverse geographic area.Moving multi communication network 110 can comprise as Fig. 1 present long-term evolution network 112 (such as 4G LTE), according to the wide band code division division of labor (WCDMA) standard or international mobile communication 2000 (International MobileTelecommunication-2000, IMT-2000) wide band code division Division of Network 114, time division synchronous code division multiple access (TD-SCDMA) network 116 of standard running, and mobile communication global system (GSM) network 118.Should be noted that, moving multi communication network 110 also can comprise the mobile communication standard that Fig. 1 does not draw.
If for obtaining Communications service, wireless communication apparatus 104 first must search available communication network in moving multi communication network 110, and sets up with this communication network and link.Each network can comply with its relevant criterion usually, carries out communication in multiple different frequency range and wireless communication apparatus 104; So-called frequency range is the frequency range that confession under directions wireless communication apparatus and network carry out transfer of data.Each frequency range comprises a centre frequency and a certain frequency range centered by this centre frequency.In order to obtain Communications service, wireless communication apparatus 104 need search available network usually in multiple possibility network (such as network 110), different frequency range.Obviously, the permutation and combination of heterogeneous networks and frequency range can cause a large amount of options to be sought.
Therefore, wireless communication apparatus 104 according to the present invention adopts the multimode network search technique of simultaneously carrying out, and processes multiple option to be sought rapidly, to shorten the time found required for available network.First, in a predetermined record slot (such as several milliseconds), wireless communication apparatus 104 records the radio-frequency (RF) energy received in some frequency range.The length of this predetermined record slot is enough to multiple downstream signal frames that can comprise any available network in the radio-frequency (RF) energy guaranteeing that wireless communication apparatus 104 records.After this record slot terminates, wireless communication apparatus 104 just searches the multiple communication signal whether existing and belong to different radio communication network in the radio-frequency (RF) energy (or corresponding derivative signal) recorded simultaneously.In other words, wireless communication apparatus 104 can search available network according to the radio-frequency (RF) energy parallel (simultaneously) recorded.In addition, wireless communication apparatus 104 can carry out parallel search for a particular network in different frequency range/centre frequency, and can across multiple candidate's wireless transmit-receive technology.One of the advantage of parallel search technique is: after wireless communication apparatus 104 can terminate at the record slot of aforementioned several milliseconds, with controller processing speed (such as gigahertz grade) parallel search heterogeneous networks relatively fast.
Fig. 2 presents the functional block diagram example of the wireless communication apparatus 104 that can realize aforementioned multimode formula search technique.The example of wireless communication apparatus 104 is including but not limited to smart phone, notebook computer, panel computer etc.Wireless communication apparatus 104 comprises a radio transmitter TX 206 (in order to transmit radio-frequency (RF) energy by antenna 207), one wireless receiver RX 208 (in order to receive radio frequency signal by antenna 207), one sample buffer 210 (in order to store the digital sample result corresponding to the radiofrequency signal received), one controller 212 (in order to control wireless communication apparatus 104 and to perform Web search), one controller storage 214 (instruction and data used in order to store controller 212), and one User's Interface 216 (in order to provide data to user/user's application program, and receive data from user/user's application program).
Controller 212 provides control signal 213 (such as residence time controls, centre frequency adjusts control, frequency range controls) to conveyer TX 206 and receiver RX 208, performs following work to control conveyer TX 206 with receiver RX 208.
The radio-frequency (RF) front-end circuit 208a that receiver 208 comprises can be set to receive a radiofrequency signal (radio-frequency (RF) energy) place communication frequency band (such as the frequency range of centre frequency 2.1 gigahertz, frequency range 50 megahertz), the radio-frequency (RF) energy frequency reducing received is converted to the fundamental frequency energy in a fundamental frequency, and provide this fundamental frequency (or nearly fundamental frequency) energy to analog-digital converter 208b.Receiver 208 can be set to receive and processes across large frequency range and belong to the radio-frequency (RF) energy of multiple mobile communication network, such as 200 megahertz ~ 2 gigahertzs or 3 gigahertzs.Conveyer TX 206 can process and transmit the radiofrequency signal of similar frequency range.In addition, conveyer TX 206 and receiver RX 208 frequency of transmission/reception can all have quite meticulous adjustable unit (such as with 1 kilo hertz for unit of adjustment), to aim at the communication signal of heterogeneous networks.
Analog-digital converter 208b is responsible for the fundamental frequency capacity N exported by radio-frequency (RF) front-end circuit 208a, to produce corresponding a succession of sample.The sample frequency that analog-digital converter 208b adopts is designed to height to be enough to make the frequency range of produced effective sample contain whole or most of target frequency bands (such as the scope of 50 ~ 100 megahertzes) to (such as 250 megahertzes).In an embodiment, analog-digital converter 208b can produce homophase (I) sample and orthogonal (Q) sample that phase difference is 90 °.
Low pass filter 208c is the sampled signal in order to export according to a lowpass band filter analogue digital quantizer 208b, filters rear sample 266 to produce.Controller 212 sets this lowpass band (being such as set as 50 megahertzes, 25 megahertzes, 10 megahertzes, 5 megahertzes, 3 megahertzes or 1.25 megahertzes) by the frequency range control signal in control signal 213.Sample 266 after filtration is provided to sample buffer 210 and controller 212 by low pass filter 208c.In the following description, after filtering, sample 266 is also called " sample energy " that can represent the radio-frequency (RF) energy that radio-frequency (RF) front-end circuit 208a receives.In another embodiment, low pass filter 208c is omitted, to avoid the composition of sample frequency limitation produced analog-digital converter 208b.
Sample buffer 210 comprises enough storage areas, to deposit sample 266 after multiple filtrations of producing in a scheduled time slot (such as 5 or 10 milliseconds).In other words, sample buffer 210 can store the sampled result in a period of time, to represent the radio-frequency (RF) energy in one corresponding period.In practice, sample buffer 210 can comprise one or more volatibility or non-volatile memory device, such as random-access semiconductor memory, read-only memory, magnetic and/or optical memory, flash memory.
The sample energy that controller 212 stores according to sample buffer 210 carries out according to search technique of the present invention.Controller 212 can comprise a digital baseband processor, such as a digital signal processor, in order to perform the communication signal handling procedure relevant to conveyer TX 206, receiver RX 208, such as but not limited to coding/decoding, modulating/demodulating and filtration.Controller 212 also can comprise a control processor, in order to perform high-order control and the Web search program of wireless communication apparatus 104.Controller 212 captures sample energy in sample buffer 210, and in memory 214 fetch instructions and data.
Memory 214 can be but is not limited to read-only memory (ROM), random access memory (RAM), magnetic storage medium device, optical storage media device, flash memory, electronic type memory.Memory 214 can comprise one or more computer-readable storage medium (such as a storage arrangement), wherein stores or be written into software kit containing computer-executable instructions; When this software is performed by controller 212, just corresponding operation can be realized.For example, memory 214 can store and maybe can be written into multimode network search logic 220, to realize according to search technique of the present invention.Multimode network searches logic 220 can comprise the frequency scanning logic 224 that (i) analyze in order to perform fast fourier transform (FFT) and frequency-domain received signal intensity index (RSSI), and (ii) is in order to carry out the network base station search logic 226 of base station search simultaneously for heterogeneous networks wireless transmit-receive technology.
In addition, memory 214 also can stored logic 220 data that use and/or produce, a such as wireless transmit-receive technology parameter/restricting data storehouse 230, and the multi-mode radio transmit-receive technology parameter wherein comprising heterogeneous networks wireless transmit-receive technology limits with searching.For each wireless transmit-receive technology, parameter/restricting data storehouse 230 can comprise an other wireless transmit-receive technology data assemblies.Each wireless transmit-receive technology data assemblies has listed the many kinds of parameters relevant to this specific wireless transmit-receive technology, such as frequency range and secondary frequency band, operation frequency range, dual-mode etc.Fig. 7 presents the data assemblies example of a long-term evolution (LTE) network.
Fig. 3 presents a flow chart, in order to the multimode network method for searching 300 that wireless communication apparatus 104 can adopt under the control of controller 212 to be described.Controller 212 actuating logic 220, to accomplish method 300.
In step 305, in order to find available communication network, first controller 212 selects a target frequency bands for searching.So-called " frequency range " general designation that is frequency range and its secondary frequency band herein.Receiver RX 208 is set to coordinate this target frequency bands (such as centered by 2.1 gigahertzs and width is the frequency range of 20 ~ 50 megahertzes) and the radio frequency signal received in this target frequency bands.In addition, the frequency range of low pass filter 208c is also adjusted to this target frequency bands applicable.In an embodiment, low pass filter 208c is omitted, with the energy making receiver RX208 receive a frequency range comparatively large (such as up to 1 gigahertz).
In step 310, controller 212 makes sample buffer 210 stored samples 266 in a scheduled time slot (such as but not limited to 5 or 10 milliseconds).These sampled result can represent the radio-frequency (RF) energy that receiver RX 208 receives.The length of this scheduled time slot is enough to receive the several continuous print data frame in downstream signal.For LTE wireless transmit-receive technology, the length of this scheduled time slot should be enough to receive six or seven continuous print resource block (resource block) in downstream signal.
Then, in step 315-340, controller 212 obtains corresponding to the sampled result of radio-frequency (RF) energy from sample buffer 210, obtains network parameter/restricting data combination from database 230, and according to this data assemblies process sampled result, to search different wireless transmit-receive technologies simultaneously, details are as follows.
In step 315, controller 212 utilizes the technology such as fast fourier transform that sample energy is converted to frequency domain from time domain, and carries out received signal strength index (RSSI) scanning, to detect the energy grade in this frequency domain in frequency domain.
In step 318, controller 212, according to the energy grade detected, assigns priority to each frequency.The frequency that energy grade is higher is assigned with higher priority.In step 320, the higher frequency of priority selected by controller 212, and the frequency these be selected is assigned to a corresponding thread (thread) or signal processing path separately.In an embodiment, a frequency with highest energy grade can be assigned to each thread.In another embodiment, different frequencies can be assigned to different threads.In addition, in step 318, a kind of wireless transmit-receive technology is assigned to a thread by controller 212 separately.
In step 320, these sample energy searched by controller 212 simultaneously, to find out separately according to the multiple communication signal of different radio transmit-receive technology running.For this reason, controller 212 abreast/be performed with seasonal thread 320a ~ 320d, search respectively and separately there is assigned frequency and according to the communication signal of corresponding wireless transmit-receive technology (such as LTE, WCDMA, TD-SCDMA, GSM).Thread 320a ~ 320d searches corresponding communication signal (such as network downstream signal) separately in the frequency range centered by assigned frequency.In an embodiment, receiver RX 208 captures signal in one on a large scale frequency range (such as 1 gigahertz), and aforementioned assigned frequency can be this any frequency on a large scale in frequency range, such as 1 megahertz, 10 megahertzes, 500 megahertzes, 750 megahertzes etc.A particular thread in thread 320a ~ 320d itself can represent the multiple parallel thread of the multiple different frequencies for a particular network.Thread 320a ~ 320d can be implemented as the multiple signal processing paths simultaneously carried out respectively, as explanation relevant to Fig. 4 subsequently.
In step 325, whether controller 212 determining step 320 finds network.If do not find network, step 305 is merely re-executed, and carries out this flow process for a frequency range newly selected.If find network, step 330 is performed.
In step 330, confirm whether this wireless communication apparatus is granted according to corresponding wireless receiving and dispatching standard foundation link by this base station, and controller 212 judges whether the network found is applicable to by inspection broadcast information channels.If the network found out is suitable, step 335 is performed; If step 330 judges the network that finds and improper, step 340 will be performed.
In step 335, controller 212 makes wireless communication apparatus 104 connect and the network registry (being transmitted the upward signal with appropriate format by conveyer 306, by receiver 308 from this network reception downstream signal) found to step 320.Subsequently, this wireless communication apparatus just obtains mobile telecommunication service by this network.
In step 340, controller 212 upgrades network restriction/parameter database 230, to point out that this network is inappropriate or some characteristic of this network is inappropriate.For example, the wireless transmit-receive technology data assemblies corresponding to this inappropriate wireless transmit-receive technology in database 230 can be updated to points out that the frequency range that step 305 is selected is not useable for this wireless transmit-receive technology, but other frequency ranges are still available.After step 340, step 318 is merely re-executed, and searches priority to change according to the database 230 after renewal.
Foregoing routine can be repeatedly executed.
Fig. 4 presents the succession of steps 400 after being launched by any one thread in thread 320a ~ 320d.In general, step 400 also represents a digital signal processing path (any one thread corresponding in thread 320a ~ 320d), sequentially processes sample energy, to search a specific wireless transmit-receive technology.As mentioned above, in step 318, a characteristic frequency to be sought and a specific wireless transmit-receive technology are assigned to step 400.
In step 405, if the centre frequency of this characteristic frequency is different from fundamental frequency, the frequency spectrum of sample energy is moved (such as passing through frequency compounding) to fundamental frequency (such as zero hertz) by controller 212.This step can be set to responsible different frequency range (corresponding to the frequency range that receiver RX 208 receives in step 305, and the frequency spectrum bands of fast fourier transform in step 315) by each thread of military order.For example, one first thread can by this frequency spectrum frequency displacement one first assigned frequency, and one second thread can by this frequency spectrum frequency displacement one second assigned frequency, and the rest may be inferred.Detailed example can see the related description of Fig. 5 and Fig. 6.
In step 410, controller 212 is by down-sampled for sample energy (decimate), that is (i) with anti-folded filtering (anti-aliasing) frequently for target imposes low-pass filter to sample energy, and capture the frequency range that a section corresponds to target downlink signal, and sample energy after (ii) this low-pass filter down-sampled.Step 410 produce down-sampled after sample.
Step 405 and 410 common designation controllers 212 are before step 415 to the adaptive signal transacting that sampled result imposes.
In step 415, controller 212, according to the wireless transmit-receive technology of specifying, carries out network base station search for down-sampled rear sample.Base station search is the basic function of mobile communcations system, and wireless communication apparatus can be made whereby synchronous with the time/frequency of mobile communication network.Generally speaking, wireless communication apparatus is that to utilize the down-going synchronous channel of mobile communication network to reach time/frequency synchronous.For LTE, network base station search comprises and imposes following handling procedure to the network downstream signal frame in received energy: the detected symbol time (symboltiming) with frequency shift (FS), detect a base station identification code group, signal frame time and other base stations peculiar information, and detect a base station identification code according to downlink reference signal.As persond having ordinary knowledge in the technical field of the present invention is intelligible, any known or future the network base station search technique developed all can be used to step 415.
Fig. 5 and Fig. 6 presents the search strategy example that can be implemented in method 300.The frequency spectrum example that the fast fourier transform of Fig. 5 rendering step 315 produces for sample energy.Should be noted that, the frequency in frequency spectrum 500 is changed through frequency reducing.Fig. 6 is that the concept of the flow chart of Fig. 3 is extracted, in order to illustrate ordered steps 318 and parallel lines journey 320a ~ 320d, 602 ~ 608 relativeness.The search parameter being assigned to each thread is also marked in wherein, comprises the centre frequency (CF) corresponding to Fig. 5 and the frequency range relevant to this centre frequency (BW).
Refer to Fig. 5, the energy height corresponding according to each centre frequency, priority P1 from high to low, P2, P3 are assigned to centre frequency F1, F2, F3 by ordered steps 318 respectively.Then, the bandwidth information in the network data combination stored by priority P1, P2, P3 and database 230, centre frequency F1, F2, F3 and corresponding frequency range thereof are assigned to each the parallel thread in Fig. 6 by step 318.WCDMA searches thread 320b and is assigned with centre frequency=F1, frequency range=5 megahertz; TD-SCDMA searches thread 320c and is assigned with centre frequency=F1, frequency range=5 megahertz; GSM searches thread 320d and is assigned with centre frequency=F2, frequency range=10 megahertz.As shown in Figure 6, search thread 320a and be broken into further multiple parallel thread 602 ~ 608, carry out LTE base station search according to different parameters separately, and its centre frequency be spaced apart 125 kilo hertzs.LTE searches thread 602 and is assigned with centre frequency=F1, frequency range=3 megahertz; LTE searches thread 604 and is assigned with centre frequency=F1+125 kilohertz, frequency range=3 megahertz; LTE searches thread 606 and is assigned with centre frequency=F1+250 kilohertz, frequency range=3 megahertz; LTE searches thread 608 and is assigned with centre frequency=F1+375 kilohertz, frequency range=5 megahertz.Above-mentioned each thread can be implemented as and be similar to the separate signal processing path shown in Fig. 4 separately.
Should be noted that, other search changes also having many kinds to be different from Fig. 6 may be utilized.Can be found out by the example of Fig. 5 and Fig. 6, controller 212 can search multiple different wireless transmit-receive technology, centre frequency, frequency range according to single group of received energy record simultaneously.
Fig. 7 presents LTE data assemblies 700 example in storage data storehouse 230.As discussed previously, the data assemblies of various different radio transmit-receive technology can be stored by similar mode.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (20)
1. a method for moving multi communication network search, comprises:
A (), in a predetermined period, the multiple radiofrequency signals for wireless receiving are carried out sampling and are recorded a sampled result, this sampled result has about a radio-frequency (RF) energy;
B (), after this predetermined period terminates, searches the multiple communication signals belonging to multiple different mobile communication standard in this recorded sampled result simultaneously; And
If c () finds one of the plurality of communication signal in this sampled result, attempt setting up wireless link with the communication network belonging to this communication signal.
2. the method for claim 1, is characterized in that, step (b) comprises further: in this recorded sampled result, search the multiple communication signals belonging to same mobile communication standard.
3. the method for claim 1, comprises further:
In the frequency range that this sampled result contains, detect the multiple energy grades of this sampled result in this frequency range; And
According to the highest energy grade in the plurality of energy grade detected, select multiple frequency;
Wherein step (b) is contained in this sampled result in the frequency range corresponding to of the plurality of frequency be selected, and searches each communication signal simultaneously.
4. method as claimed in claim 3, comprises execution one fast fourier transform, further so that this sampled result is converted to frequency domain.
5. method as claimed in claim 3, it is characterized in that, step (b) comprises simultaneously in multiple this sampled result of separate signal processing path process, and wherein processing this sampled result in each signal processing path is a frequency according to being assigned in the mobile communication standard be assigned in the plurality of different mobile communication standard and the plurality of frequency be selected.
6. method as claimed in claim 5, is characterized in that, this, simultaneously in the step of multiple this sampled result of separate signal processing path process, in each signal processing path, comprises:
If this frequency being assigned to this signal processing path is different from a fundamental frequency, this sampled result is mixed to this fundamental frequency;
According to the frequency range that this mobile communication standard being assigned to this signal processing path defines, by down-sampled for this sampled result, obtain a down-sampled rear signal; And
One mobile communication network base station search is imposed to this down-sampled rear signal.
7. method as claimed in claim 6, is characterized in that, impose this mobile communication network base station search and comprise:
According to following mobile communication standard one searches: long-term evolution network standard, wide band code division division of labor standard, and mobile communication global system standard.
8. the method for claim 1, it is characterized in that, search in this sampled result while that step (b) comprising and belong to long-term evolution network standard, wide band code division division of labor standard separately, and multiple communication signals of mobile communication global system standard.
9. the method for claim 1, is characterized in that, the scope of this period predetermined is between four to ten milliseconds.
10. a wireless communication apparatus, can search for moving multi communication network, comprise:
One wireless transceiver, be used to carry out sampling for multiple radiofrequency signals of wireless receiving and record a sampled result in predetermined period, this sampled result has about a radio-frequency (RF) energy;
One memory, in order to store this sampled result; And
One processor, is coupled to this wireless transceiver and this memory, in order to:
After this predetermined period terminates, in this recorded sampled result, search the multiple communication signals belonging to multiple different mobile communication standard simultaneously; And
If find one of the plurality of communication signal in this sampled result, attempt setting up wireless link with the communication network belonging to this communication signal.
11. devices as claimed in claim 10, is characterized in that, this processor be used to further search the multiple communication signals belonging to same mobile communication standard in this sampled result of recording.
12. devices as claimed in claim 10, is characterized in that, this processor by further in order to:
In the frequency range that this sampled result contains, detect the multiple energy grades of this sampled result in this frequency range; And
According to the highest energy grade in the plurality of energy grade detected, select multiple frequency;
Wherein this processor by be used to further be selected one of the plurality of frequency corresponding to a frequency range in this sampled result, search each communication signal simultaneously.
13. devices as claimed in claim 12, is characterized in that, this processor by further in order to perform a fast fourier transform, so that this sampled result is converted to frequency domain.
14. devices as claimed in claim 12, it is characterized in that, this processor is by further in order to simultaneously in multiple this sampled result of separate signal processing path process, and wherein processing this sampled result in each signal processing path is a frequency according to being assigned in the mobile communication standard be assigned in the plurality of different mobile communication standard and the plurality of frequency be selected.
15. devices as claimed in claim 14, is characterized in that, this processor is by further in order to seasonal each signal processing path:
If this frequency being assigned to this signal processing path is different from a fundamental frequency, this sampled result is mixed to this fundamental frequency;
According to the frequency range that this mobile communication standard being assigned to this signal processing path defines, by down-sampled for this sampled result, obtain a down-sampled rear signal; And
One mobile communication network base station search is imposed to this down-sampled rear signal.
16. devices as claimed in claim 15, it is characterized in that, this processor carries out this mobile communication network base station search according to one of following mobile communication standard: long-term evolution network standard, wide band code division division of labor standard, and mobile communication global system standard.
17. devices as claimed in claim 10, is characterized in that, this processor is searched simultaneously and belonged to long-term evolution network standard, wide band code division division of labor standard separately in this sampled result, and multiple communication signals of mobile communication global system standard.
18. devices as claimed in claim 10, it is characterized in that, the scope of this period predetermined is between four to ten milliseconds.
19. 1 kinds of non-transient state entity handles device fetch mediums, wherein store can by one processor perform multiple instructions, the plurality of instruction be performed this processor of rear drive with:
Obtain a sampled result, this sampled result can represent a radio-frequency (RF) energy of multiple radiofrequency signals of wireless receiving in predetermined period;
Search the multiple communication signals belonging to multiple different mobile communication standards separately in this sampled result simultaneously; And
If find one of the plurality of communication signal in this sampled result, attempt setting up wireless link with the communication network belonging to this communication signal.
20. processor fetch mediums as claimed in claim 19, is characterized in that, this searches the multiple communication signals comprising further and search in this sampled result simultaneously and belong to same mobile communication standard simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/245,023 US10154448B2 (en) | 2014-04-04 | 2014-04-04 | Multimode mobile communication network search in a wireless communication device |
| US14/245,023 | 2014-04-04 |
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| CN104980995A true CN104980995A (en) | 2015-10-14 |
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| US20100091688A1 (en) * | 2008-10-14 | 2010-04-15 | Texas Instruments Incorporated | Simultaneous multiple signal reception and transmission using frequency multiplexing and shared processing |
| US20120026039A1 (en) * | 2010-07-27 | 2012-02-02 | Texas Instruments Incorporated | Single rf receiver chain architecture for gps, galileo and glonass navigation systems, and other circuits, systems and processes |
| CN103139873A (en) * | 2011-11-21 | 2013-06-05 | 美国博通公司 | Wireless communication device capable of efficient network search |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201540094A (en) | 2015-10-16 |
| US10154448B2 (en) | 2018-12-11 |
| TWI575976B (en) | 2017-03-21 |
| US20150289198A1 (en) | 2015-10-08 |
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